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https://issues.apache.org/jira/browse/HADOOP-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-2815:
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Component/s: dfs
While the intention is understandable, it appears difficult to define a
semantics that is generally applicable. In a model where the file system runs
forever, there may be no opportunity (start/stop) for cleanup. If the file
system is abruptly terminated, does the application really want the files to go
away (even if the loss of the file system was not observed)? If the application
closes its access to the file system before cleaning house, maybe there is a
solution within the application. If the application ever restarts, perhaps that
is an opportunity to clean house.
The idea of building a sandbox where applications can execute and be confident
that all resources are released when the application terminates is attractive,
but not a short-term effort.
> support for DeleteOnExit
> ------------------------
>
> Key: HADOOP-2815
> URL: https://issues.apache.org/jira/browse/HADOOP-2815
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Olga Natkovich
>
> Pig creates temp files that it wants to be removed at the end of the
> processing. The code that removes the temp file is in the shutdown hook so
> that they get removed both under normal shutdown as well as when process gets
> killed.
> The problem that we are seeing is that by the time the code is called the DFS
> might already be closed and the delete fails leaving temp files behind. Since
> we have no control over the shutdown order, we have no way to make sure that
> the files get removed.
> One way to solve this issue is to be able to mark the files as temp files so
> that hadoop can remove them during its shutdown.
> The stack trace I am seeing is
> at org.apache.hadoop.dfs.DFSClient.checkOpen(DFSClient.java:158)
> at org.apache.hadoop.dfs.DFSClient.delete(DFSClient.java:417)
> at
> org.apache.hadoop.dfs.DistributedFileSystem.delete(DistributedFileSystem.java:144)
> at
> org.apache.pig.backend.hadoop.datastorage.HPath.delete(HPath.java:96)
> at org.apache.pig.impl.io.FileLocalizer$1.run(FileLocalizer.java:275)
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